More tests for FileChunkManager
FileChunkManager uses a URI (which will be passed in via a
FileSystemProvider) a default scheme of file is assumed, so
our:/path/to/metadata?scheme=file
is equivalent to
our:/path/to/metadata
Converted back to FileChunkManager only taking a path. The URI
conversion will be handled by the OuranosPath
Basic implementation of FileSystemProvider, FileSystem, and Path. The
URI scheme appends path information to the fragment and uses the query
portion to keep track of which scheme the metadata file is.